ML19329E835
| ML19329E835 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/15/1977 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| References | |
| 3318, NUDOCS 8006180625 | |
| Download: ML19329E835 (8) | |
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Censumers 90"f3r
{N Stephen H. Howell Vice hesident
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General of fices: 1945 West Pernail Road, Jackson, Michigan 49201
- Aree Coe 517 788-0453 Farch 15, 1977 IElHIOR'iDR..,,aw/(
Director of Nuclear Reactor Regulation Attention: !& Roger Boyd, Director Division of Project Management US duelear Regulatory Comission Washington, DC 20555 MIDLAND PROJECT DOCKET HUMBERS 50-329, 50-330 APPENDIX I -
RESPONSE TO REQUEST FOR ADDITIONAL INFORISTION FILE: 0505.2 SERIAL: 3318 By letter dated November 16, 1976 Mr S A Varga transmitted a request for addi-tional information concerning the Midland Appendix I submittal of June 1,1976.
Attached per your request is our response to the questions in the enclosure to Mr Varga's letter.
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l RESPONSE TO REQUEOT FOR ADDITIONAL I!! FORMATIO:I O!! APPE!! DIX I Hovember 16, 1976 Letter.
MIDLAIID 1RTITS 1 A!ID 2 Docket Numbers 50-329/330 Questions 1 and 2 1.
In the discussion of intermittent releases (p 60, Appendix B), the state-ment is made that, "Normally the gas from the radvaste gas decay tanks is released during favorable meteorological conditions",
Define " favorable meteorological conditions" in this context.
a.
b.
Identify the operating experience that supports that statement.
I c.
Discuss how " favorable meteorological conditions ' will be determined prior to release, d.
Indicate if the technical specifications developed for this plant will reflect releases from the radwaste gas decay tanks during " favorable meteorological conditions".
2.
Also in the discussion of intermittent releases, it is stated that, "The iodine activity in the reactor building can be reduced by operating the internal cleanup system for longer periods (prior to purge) if favorable meteorological conditions do not exist".
Discuss how " favorable meteorological conditions" will be determined a.
prior to purge.
b.
Indicate if the technical specifications developed for this plant will reflect releases resulting from reactor building purges during
" favorable meteorological conditions" without operating the " internal cleanup system" or that the " internal cleanup system" vill be operating if " favorable meteorological conditions" do not exist at the time of release.
Response
The following statements were made in the Midland Appendix I submittal of June 1, 1976: _
1.-
"Horma11y the gas from the radwaste gas decay tanks is released during favorable meteorological conditions."
2.
"The iodine activity in the reactor building can be reduced by opera-ting the internal cleanup system for longer periods (prior to purge) if favorabic meteorological conditions do not exist."
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q These statements vore intended to mean only that judgement could be exercised with respect to existing meteorological conditions, when practicable, in the timing of radvaste gas system and ructor building purge batch releases. They were not intended to imply that any explicit program vill be used to determine specific conditions before releases nor were they intended to mean that cor-responding technical specificatens would be Eenerated. The statements can be de.leted from the submittal without affecting the conclusions of the report.
Question 3 Onsite meteorological measurements collected during the period March 1,1975.
to February 29, 1976 have been compared with long-ters (19hl-1970) meteorological data collected at Flint. A comparison of concurrent data (March 1,1975 to February 29,1976) from Flint with the long-term data from Flint should provide a more meaningful justification of the representativeness of the available on-site data.
a.
Indicate if such a comparison of Flint data was made, and discuss the results; or b.
If such a comparison of Flint data was not made, indicate if this com-parison is anticipated, or discuss the rationale for not making the comparison.
Response
A comparison of concurrent data (March 1,1975 to February 29,1976) from Flint with the long-term data from Flint (1966-1975) was made. This long-term data period was used because it'is the most recent record available with anemometer heights similar to those in the concurrent data. The joint. wind frequency dis-tribution by stability class, shown in Table 1, shows a very good agreement be-tween the two data sets.
A more detailed analysis vill be provided in the FSAR scheduled for submittal in September 1977 in which the two-year data period (March 1,1975 to Febru-ary 26, 1977) from Flint vill be compared with the long-term data from Flint -
as voll as the onsite data. The comparisons will be more meaningful with the use of an additional year of onsite data.
Question h The modifications to_the straight-line flow model to account for possible recirculation of air flow, as presented in Regulatory Guide 1.111, may not be applicable to the Midland site. However, the correction factors for open ter-rain presented in Regulatory Guide 1.111 were developed as a result of comparing calculations of relative concentration (X/Q) values using a variable-trajectory (puff-advection) model and a straight-line flow model, both using 1
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meteorologic'al data from a Midwest site not unlike Midland. The discussion of.
" Airflow Trajectory Regimes"-(p 62, Appendix B) is not sufficient for using the straight-line flow model without modifications for effects of spatial and temporal variations in' airflow.
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a.
Provide additional substantiation and justification that calculations of _ X/Q values using the straight-line flow model without modifications to account for possible recirculation of airflow are rea:onably repre-sentative. or conservative for. the Midland site; or
.b.. Develop site-specific modifications to the straight-line flow model to consider the effects of spatial and temporal variations in airflow.
Response
-The Midland Appendix I Submittal was transmitted prior to completion of finalized engineering design work on specific release points and hei hts. Ground level 5
4 releases were thus conservatively assumed. Detailed information on the release points and hei6 hts will be available for submittal in the FSAR. The relative concentrations (X/Q) based on two years of onsite data and using the " Split-R
model and the terrain adjustment factors as appropriate vill be preser.ted in the FSAR.
Question 5 Identify the nearest milk or meat animal out to a distance of five miles, by sector that may exist at locations other than dairy farms or cattle farms, iResponse Although Tables B-3 and B 4 of the Midland Appendix I Submittal are labeled
" NEAREST DAIRI FARIE" and " NEAREST CATTLE FAR!G", respectively, they do ide'ntify the nearest milk or meat' animals out to a distance of five miles. The informa-tion is based on:a survey conducted in May of 197k. A list of dairy farms within 10 miles was obtained from the county agriculture agent and verified in
.May 1974.
In' addition a ' survey was conducted.to locate all dairy cows, beef
' cattle, and goats within a 5 mile radius of the plant except for residential l areas within the Midland city limits where lack of adequate pasture land pro-
.hibits grazing. No goats were found within 5 miles of the site.
~ A new survey will be conducted during the 1977 grazing period and vill be used as a basis for the analyses to be presented in the Midland ER and FSAR.
Question 6-Indicate where the-main condenser air ejector exhaust is released from the plant,
. and.the provisions' incorporated to reduce radioactive relea'ses through this-
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exhaust system. Provide a description of this release point, including height above grade, height above and relative location to adjacent structures, relative temperature difference between gasseous effluent and ambient, flow rate, velocity, and size and shape of the vent outlet.
Reepense The main condenser air ejector exhausts are located on the top of the turbine buildin6 roof as shown on the enclosed drawing. The release point height is 88' above grade and approximately 10' above the turbine building roof, which is at elevation 712'.
The exhausts are 10" diameter circular pipes, one for each unit.
The main condenser air ejector exhausts are combined with the steam packing exhausts at the release point, although the air ejector exhausts comprise only about 5-6% of the total volumetric flow. Maximum effluent temperatures and flow velocities for the ecmbined stream are tabulated below:
Wrimum Effluent Te=perature ( F)
Maximum Effluent Sur:mer Winter Exit Velocity (ft/s)
Unit 1 Main condenser 185 185 22 Air ejector vent Unit 2 Main condenser 182 182 36 Air ejector vent There are no specific provisions incorporated to reduce radioactive releases I
through this exhaust system.
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Question 7 Provide the expected temperature of the effluent from the 66-inch diameter stack through which the reactor building is purged.
Response
The maximum temperature of the effluents released through the 66" reactor build-ing ventilation and air room purge exhausts is approximately 120 F during the summer and 112*F during the vinter.
Question 8 Indicate whether there are diffusers or spreaders on any release point.
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Response
Diffusers or spreaders will not be located on any of the gaseous effluent release points. Any potential liquid effluent releases vill be made through
'he cooling pond blevdown discharge structure, which vill be equipped with a diffuser for thermal plume dispersion.
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TABLE 1 Joint Wind Frequency Distribution By Stability Class at Flint,flichigan Jan 1, 1966-Dec 31. 1975 Mar 1, 1975-Feb 29, 1976 Average Average Stability Percent Wind Speed Percent Wind Speed Class Occurrence (mph)
Occurrence (mph)
A 0.36 3.6 0.h7 3.6 B
3 95 5.2 3.73 4.9 C
8.79 77 9 21 75 D
62.14 10.5 60.75 10.5 E
n.28 6.6 n.60 6.h F
13.45
'39 14.21 3.8 Data Source:
US Department of Commerce,1976: Monthly and Annual, Wind Distribution of Pasquill Stability Classes, " STAR" Program. Station //14826, Flint, Michigan for_ the period 3/75 - 2/76 and 1/66 - 12/75 National Climath Center,
. Asheville, NC.
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4RC DISTRIBUTION FoR PART 50 DOCKET MATERIAL TO: Mr. R. Boyd FROM: Consumers Power Company oATE OF ooCUMENT 3-15-77 Jackson, Mich. 49201
- 2. McDowell o^TE givg (ILETTE R ONoroRizED PROP INPUT FORM NUMBER oF COPIES RECEIVEo (gontGINAL UkENCLASSIFIE D 9
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"'8 oESCRIPTION Ltr re our 11-16-76 ler....trans the Response to NRC ltr of 11-16-76 following:
(1P) regarding Appendix I info with attached photo antitled " Station Arrangement Showing Air Ejector Exhaust Locations".....(7P) l
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ACKNOWLEDGED W + A [1#.6 's *
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